/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package org.apache.jmeter.gui.util;

import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

import org.apache.jmeter.gui.JMeterFileFilter;
import org.apache.jmeter.gui.ReportGuiPackage;
import org.apache.jmeter.util.JMeterUtils;

public final class ReportFileDialoger {
	/**
	 * The last directory visited by the user while choosing Files.
	 */
	private static String lastJFCDirectory = null;

	private static JFileChooser jfc = new JFileChooser();

	/**
	 * Prevent instantiation of utility class.
	 */
	private ReportFileDialoger() {
	}

	/**
	 * Prompts the user to choose a file from their filesystems for our own
	 * devious uses. This method maintains the last directory the user visited
	 * before dismissing the dialog. This does NOT imply they actually chose a
	 * file from that directory, only that they closed the dialog there. It is
	 * the caller's responsibility to check to see if the selected file is
	 * non-null.
	 * 
	 * @return the JFileChooser that interacted with the user, after they are
	 *         finished using it (accept or otherwise).
	 */
	public static JFileChooser promptToOpenFile(String[] exts) {
		// JFileChooser jfc = null;

		if (lastJFCDirectory == null) {
			String start = JMeterUtils.getPropDefault("user.dir", "");

			if (!start.equals("")) {
				jfc.setCurrentDirectory(new File(start));
			}
		}
		clearFileFilters();
		jfc.addChoosableFileFilter(new JMeterFileFilter(exts));
		int retVal = jfc.showOpenDialog(ReportGuiPackage.getInstance().getMainFrame());
		lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();

		if (retVal == JFileChooser.APPROVE_OPTION) {
			return jfc;
		} else {
			return null;
		}
	}

	private static void clearFileFilters() {
		FileFilter[] filters = jfc.getChoosableFileFilters();
		for (int x = 0; x < filters.length; x++) {
			jfc.removeChoosableFileFilter(filters[x]);
		}
	}

	public static JFileChooser promptToOpenFile() {
		return promptToOpenFile(new String[0]);
	}

	/**
	 * Prompts the user to choose a file from their filesystems for our own
	 * devious uses. This method maintains the last directory the user visited
	 * before dismissing the dialog. This does NOT imply they actually chose a
	 * file from that directory, only that they closed the dialog there. It is
	 * the caller's responsibility to check to see if the selected file is
	 * non-null.
	 * 
	 * @return the JFileChooser that interacted with the user, after they are
	 *         finished using it (accept or otherwise).
	 * @see #promptToOpenFile()
	 */
	public static JFileChooser promptToSaveFile(String filename) {
		return promptToSaveFile(filename, null);
	}

	/**
	 * Get a JFileChooser with a new FileFilter.
	 * 
	 * @param filename
	 * @param extensions
	 * @return JFileChooser 
	 */
	public static JFileChooser promptToSaveFile(String filename, String[] extensions) {
		if (lastJFCDirectory == null) {
			String start = JMeterUtils.getPropDefault("user.dir", "");
			if (!start.equals("")) {
				jfc = new JFileChooser(new File(start));
			}
			lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();
		}
		String ext = ".jmx";
		if (filename != null) {
			jfc.setSelectedFile(new File(lastJFCDirectory, filename));
			int i = -1;
			if ((i = filename.lastIndexOf(".")) > -1) {
				ext = filename.substring(i);
			}
		}
		clearFileFilters();
		if (extensions != null) {
			jfc.addChoosableFileFilter(new JMeterFileFilter(extensions));
		} else {
			jfc.addChoosableFileFilter(new JMeterFileFilter(new String[] { ext }));
		}

		int retVal = jfc.showSaveDialog(ReportGuiPackage.getInstance().getMainFrame());
		lastJFCDirectory = jfc.getCurrentDirectory().getAbsolutePath();
		if (retVal == JFileChooser.APPROVE_OPTION) {
			return jfc;
		} else {
			return null;
		}
	}
}
